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AUG 3 i 1962
jou-rwaia oi standards
t Library, N.W. Bldg
CRPL-F216 PART A FOR OFFICIAL USE
PART A
IONOSPHERIC DATA
ISSUED AUGUST 1962
U. S. DEPARTMENT OF COMMERCE NATIONAL BUREAU OF STANDARDS
CENTRAL RADIO PROPAGATION LABORATORY BOULDER, COLORADO
CRPL-F 216 NATIONAL BUREAU OF STANDARDS CENTRAL RADIO PROPAGATION LABORATORY
BOULDER, COLORADO
Issued 22 Aus? 19A? >ART A
IONOSPHERIC DATA
CONTENTS
Page
Ionospheric Data (revised text) . ii
Table of Smoothed Observed Zurich Sunspot Numbers . ... iii
World-Wide Sources of Ionospheric Data . iv
Tabulations of Electron Density Data -- Special Notice follows p. v.
Tables of Ionospheric Data. 1
Graphs of Ionospheric Data. 26
Index of Tables and Graphs of Ionospheric Data in CRPL-F216 (Part A). 51
i i
IONOSPHERIC DATA
The CRPL-F series bulletins are issued as part of the responsibility of the Central Radio Propagation Laboratory for the exchange and dissem¬ ination of ionospheric and related geophysical data. While originally a by-product of the collection of data by the CRPL for use in radio propa¬ gation studies, the CRPL-F series bulletins, Part A, "Ionospheric Data," and Part B, "Solar-Geophysical Data," have provided useful service by col¬ lecting and making available a wide variety of data in convenient form for use in research, not only on radio propagation and the ionosphere, but also on a wide variety of geophysical problems. Beginning with CRPL-F 211, Part A, "Ionospheric Data," a number of changes have been made in the tables of ionospheric data which, by providing more information, should increase their usefulness.
The current form of the tables of ionospheric data provides the monthly medians and, in addition, the number of values entering into median determination (count) for all ionospheric characteristics listed. Also, the upper and lower quartile values, indicated by UQ and LQ in the tables, are listed for foF2, h’F2, h'F, and (M3000)F2. Quartile values are not listed for the other characteristics because of space limitations. The tables are prepared by IBM machine methods, which, by improving the speed and ef¬ ficiency of preparation, permit earlier publication of the data.
Graphs of critical frequencies and (M3Q00)F2 will continue to appear. Graphs of percentage of time of occurrence for fEs and virtual heights of the regular ionospheric layers are no longer included. This change was necessary to provide space for the enlarged tables. Data on percentage of time of occurrence of fEs above 3, 5, and 7 Me are still available from the CRPL and the IGY World Data Center A for Airgiow and Ionosphere.
For many years, the tables of ionospheric data appearing in the F- series, Part A, listed values of medians recomputed at CRPL. While this practice enforced a certain uniformity, it was subject to some valid criti¬ cism for tampering with original data. The tables and graphs now show the ionospheric data just as they are provided by the originating laboratory. Responsibility for the accuracy and reliability of the data now rests en¬ tirely with the originator.
Gaps in the tables when data normally might be expected indicate the data were not provided by the originator. Following the recommendation of the World-Wide Soundings Committee, only values of median foEs are listed. In the few cases where fEs is still reported instead of foEs, the data will not be printed. Data will appear in the F-series, Part A, only when the complete daily-hourly tabulations have been received by the CRPL or the IGY World Data Center A for Airgiow and Ionosphere.
Ill
Information on symbols, terminology, and conventions may be found
in the "URSI Handbook, of Ionogram Interpretation and Reduction, of the
World-Wide Soundings Committee," edited by W. R. Piggott and K, Rawer
(Elsevier, 1961), which supersedes previous documents. A list of symbols
is available from CRPL on request.
The following table contains the latest available information on
smoothed observed Zurich sunspot numbers, beginning with the minimum of
April 1954. Final numbers are listed through June 1961, the succeeding
values being based on provisional data.
Smoothed Observed Zurich Sunspot Number
Month Jan. Feb . Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec.
1954 3 4 4 5 7 8 8 9 12
1955 14 16 19 23 29 35 40 46 55 64 73 81
1956 89 98 109 119 127 137 146 150 151 156 160 164
1957 170 172 174 181 186 188 191 194 197 200 201 200
1958 199 201 201 197 191 187 185 185 184 182 181 180
1959 179 177 174 169 165 161 156 151 146 141 137 132
1960 129 125 122 120 117 114 109 102 98 93 88 34
1961 80 75 69 64 60 56 53 52 52 51 50 48
1962 44
Units of Ionospheric Data Tables
foF2, foEs - - - Tenths of a megacycle
foFl, FoE - - - Hundredths of a megacycle
h'F2, h'F, h'E - Kilometers
(M3000)F2 - - - Hundredths
NOTE: Occasionally, when the median falls between two of the observed
values, the median is carried an extra decimal place beyond these units.
Those cases are easily identifiable by the extra digit appearing to the
right of the number, in a column usually left blank.
MED - Median
CNT - Count
UQ - Upper Quartile
LQ - Lower Quartile
IV
WORLD-WIDE SOURCES OF IONOSPHERIC DATA
The ionospheric data given here in tables 1 to 100 and figures 1 to 100
were assembled by the Central Radio Propagation Laboratory for analysis and
correlation, incidental to CRPL prediction of radio propagation conditions.
The data are median values unless otherwise indicated. The following are
the sources of the data in this issue:
Republica Argentina, Ministerio de Marina:
Trelew, Argentina
Tucuman, Argentina
Commonwealth of Australia, Ionospheric Prediction Service of the
Commonwealth Observatory:
Canberra, Australia
Belgian Royal Meteorological Institute:
Dourbes, Belgium
Escola Politecnica, University of Sao Paulo:
Sao Paulo, Brazil
Defence Research Board, Canada:
Clyde, Baffin I.
Eureka, Canada
Frobisher Bay, Canada
Meanook, Canada
Ottawa, Canada
Victoria, Canada
Radio Wave Research Laboratories, National Taiwan University, Taipeh,
Formosa, China:
Formosa, China
Danish National Committee of URSI:
Godhavn, Greenland
Narssarssuaq, Greenland
French National Center for Telecommunications Studies:
Casablanca, Morocco
Dakar, French West Africa
Djibouti, French Somaliland
Poitiers, France
Tamanrasset, French West Africa
Tananarive, Madagascar
Terre Adelie
Heinrich Hertz Institute, German Academy of Sciences, Berlin:
Juliusruh/Rugen, Germany
V
The Royal Netherlands Meteorological Institute:
De Bilt, Holland
Icelandic Post and Telegraph Administration:
Reykjavik, Iceland
Manila Observatory:
Baguio, P. I.
South African Council for Scientific and Industrial Research:
Salisbury, Southern Rhodesia (University College of Rhodesia and
Nyasaland)
Research Institute of National Defence, Stockholm, Sweden:
Lycksele, Sweden
United States Army Signal Corps:
Adak, Alaska
Grand Bahama I.
White Sands, New Mexico
National Bureau of Standards (Central Radio Propagation Laboratory):
Anchorage, Alaska
Boulder, Colorado
Byrd Station, Antarctica
Fairbanks (College) , Alaska (Geophysical Institute of the
University of Alaska)
Maui, Hawaii
Point Barrow, Alaska
Pole Station, Antarctica
SPECIAL NOTICE
Termination of Hourly Electron Density Profile Tabulations
Hourly N(h) profiles for the Puerto Rico station have been pub¬
lished in the CRPL-F Reports, Part A, since May 1959, starting with
the data for February 1959. This program terminated with the pub¬
lication in CRPL-F215 of the data for March 1962. It is believed
that this program has satisfied the objective of making available a
large volume of profiles produced by methods of conventional ac¬
curacy. However, in anticipation of the increasing precision
required by modern applications, we intend to concentrate further
work on the calculation of more accurate profiles, inevitably in
smaller volume.
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27
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30
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38
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39
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41
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Fig. 61. TRELEW , ARGENTINA
43.2°S , 65.3° W MAY 1958
Fig. 62. TUCUMAN, ARGENTINA 2 6.9°S , 6 5.4° W MARCH 1958
503
42
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Fig. 76. POITIERS , FRANCE 46.6°N , 0.3°E APRIL 1957
45
46
Fig. 83. CASABLANCA, MOROCCO
33 6°N , 7.6°W MARCH 1957
Fig 84 TAMANRASSET , FRENCH
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W. AFRICA
MARCH 1957
47
48
49
50
MBS 503
503
51
Index of Tables and Graphs of Ionospheric Data in CRPL-F216 (Part A)
Table page F
Adak, Alaska May 1961. 2 April 1961. 3
Anchorage, Alaska June 1961. .. 1 April 1961. 2 March 1961. 3 June 1960. 5
Baguio, P. I. June 1960. 6
Boulder, Colorado May 1961. 2 March 1961. 3
Byrd Station June 1960. 6 May 1960 .. 6
Canberra, Australia December 1958. 10 November 1958. .. 12
Casablanca, Morocco June 1957 . 17 May 195 7 . 18 April 1957 . 20 March 1957 . 21 February 1957 . 23 January 1957 . 24
Clyde, Baffin I. October 1958 . 12 August 1958. 14 July 1958 . 15 January 1958 . 16
Dakar, French W. Africa June 1957 . 17 May 1957 . 19 April 1957 . 20 March 1957 . .. 22 February 1957. 23 January 1957 . 25
De Bi'lt, Holland July 1959.. 10
Djibouti, French Somaliland June 1957 . 18 May 1957 . 19 April 1957 . 20 March 1957 . 22 February 1957. 23 January 1957 . 25
igure page
27 28
26 27 28 30
31
27 28
31 31
35 37
42 43 45 46 48 49
37 39 40 41
42 44 45 47 48 50
35
43 44 45 47 48 50
Index (CRPL-F216 (Part A), continued)
Dourbes, Belgium
October 1958 . . .
August 1958. . . .
February 1958. . .
Eureka, Canada
October 1958 . . .
Fairbanks, Alaska
July 1961.
June 1961.
May 1961 .....
April 1961 ....
June 1960.
Formosa, China
November 1959. . .
October 1959 . . .
Frobisher Bay, Canada
November 1958. . .
October 1958 . . .
July 1958.
Godhavn, Greenland
March 1961 ....
June I960.
Grand Bahama I.
June 1960.
Juliusruh/Rugen, Germany
November 1959. . .
October 1959 . . .
November 1958. . .
Lyc'ksele , Sweden
November 1959. . .
Maui, Hawaii
June 1960.
Meanook, Canada
November 1958. . .
October 1958 . . .
Narssarssuaq, Greenland
June 1960, ....
March 1960 ....
Ottawa, Canada
"November 1959. . .
August 1959. . . .
July 1959.
Point Barrow, Alaska
June 1960.
Table page Figure page
13 38
15 40
16 41
12 37
1 26
1 26
1 26
2 27
4 29
9 34
9 34
11 36
13 38
15 40
3 28
4 29
5 30
8 33
9 34
11 36
8 33
6 31
11 36
13 38
5 30
8 33
8 33
9 34
10 35
4 29
53
Index (CRPL-F216 (Part A), concluded)
Poitiers, France June 1957 . May 1957 . April 1957 . March 1957 . February 1957. January 1957 ..
Pole Station May 1960 . April 1960 . .
Reykjavik, Iceland November 1960. April 1960 . March 1960 .
Salisbury, Southern Rhodesia October 1958 .
Sao Paulo, Brazil December 1958. November 1958 . October 1958 . September 1958 .
Tamanrasset,- French W. Africa April 1957 . March 1957 . February 1957 . January 1957 .
Tananarive, Madagascar June 1957. May 1957 . April 1957 ....... March 1957 . February 1957 . January 1957 .
Terre Adelie January 1957 .
Trelew, Argentina May 1958 .
Tucuman, Argentina March 1958 . 'January 1958 .
Victoria, Canada November 1958 . October 1958 . August 1958 .
White Sands, New Mexico June 1960.
Table page Figure page
17 42 18 43 19 44 21 46 22 47 24 49
7 32 7 32
4 29 7 32 7 32
14 39
10 35 12 37 14 39 14 39
20 45 21 46 23 48 24 49
18 43 19 44 21 46 22 47 24 49 25 50
25 50
16 41
16 41 17 42
11 36 13 38 15 40
5 30
CRPL Reports
[A detailed list of CRPL publications is available from the Central Radio Propagation Laboratory upon request]
Daily: Radio disturbance forecasts, every half hour from broadcast stations WWV and WWVH of the National
Bureau of Standards. Telephoned and telegraphed reports of ionospheric, solar, geomagnetic, and radio propagation data.
Weekly: CRPL—J. North Atlantic Radio Propagation Forecast. CRPL—Jp. North Pacific Radio Propagation Forecast.
Semimonthly: CRPL—Ja.
Monthly : CRPL—D.
CRPL—F.
Semimonthly Frequency Revision Factors For CRPL Basic Radio Propagation Prediction Reports.
Basic Radio Propagation Predictions—Three months in advance. (Dept, of the Army, TB 11— 499—, monthly supplements to TM 11—499; Dept, of the Air Force, TO 31—3—28 series). On sale by Superintendent of Documents. Members of the Armed Forces should address cognizant military office.
(Part A). Ionospheric Data. (Part B). Solar-Geophysical Data.
Limited distribution. These publications are in general disseminated only to those individuals or scientific organizations which collaborate in the exchange of iono¬ spheric, solar, geomagnetic, or other radio propagation data.
Catalog of Data: A catalog of records and data on file at the U. S. IGY World Data Center A for Airglow and Ionosphere, Boulder Laboratories, National Bureau of Standards, which includes a fee schedule to cover the cost of sup¬ plying copies, is available upon request.
The publications listed above may be obtained without charge from the Central Radio Propagation Laboratory, National Bureau of Standards, Boulder Laboratories, Boulder, Colorado, unless otherwise indicated. Please note that the F series is not generally available.
Circulars of the National Bureau of Standards pertaining to Radio Sky Wave Transmission: NBS Circular 462. Ionospheric Radio Propagation. $1.25.
Instructions for the Use of Basic Radio Propagation Predictions. 30 cents. Worldwide Radio Noise Levels Expected in the Frequency Band 10 Kilocycles to 100
megacycles. 30 cents. Worldwide Occurrence of Sporadic E. $3.25.
These Circulars are on sale by the Superintendent of Documents, U. S. Government Printing Office, Washington 25, D. C. Members of the Armed Forces should address the respective military office having cognizance of radio wave propagation.
Selected Technical Notes of the National Bureau of Standards:
NBS Circular 465. NBS Circular 557.
NBS Circular 582.
NBS Tech. Note 2.
NBS Tech. Note 13.
NBS Tech. Note 18. 18-2. 18-3. 18-4.
NBS Tech. Note 31. NBS Tech. Note 40-1.
40-2. NBS Tech. Note 117.
PB151361. World Maps of F2 Critical Frequencies and Maximum Usable Frequency Factors. $3.50. PB151361-2. $3.50.
PB151372. Technical Considerations Leading to an Optimum Allocation of Radio Frequencies in the Band 25 to 60 Me. $2.50.
PB151377. Radio Noise Data for the IGY. $2.50. PB151377-2. Quarterly Radio Noise Data (Mar.-May 1959). $1.00. PB151377-3. (June-Aug. 1959). $1.00. PB151377-4, etc. (Sept.-Nov. 1959). $1.50. PB151390. An Atlas of Oblique-Incidence Ionograms. $2.25. PB151399-1. Mean Electron Density Variations of the Quiet Ionosphere, 1: March
1959 $125 PB151399-2, etc. 2: April 1959. $1.25. PB161618. Variations in Frequency of Occurrence of Sporadic E, 1949—1959. $0.75. These Technical Notes are on sale by the Office of Technical Services, U. S. Department of Commerce, Washington 25, D. C. Order by PB number.
